Heater taking long time for hot air

metzer_001

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Hi,

With the recent cold weather, I've noticed my 2011 S5 heater taking around 15-16mins for hot air to come out, and this is whilst driving too, not stationary. It just seems to be cold air blowing up until then. I have the heat setting all the way to the highest level, and have tried with the front and back window heater too.

I've checked on ODB11 and there are no errors on the heating system. Any ideas what could be the issue here? From what I've found online, it could be either the thermostat, radiator, or a flushing of the heater system.

Cheers